DAW JSON Link
Parsing Individual Members

Parsing single members from the JSON data is common. This can be to discriminate on a single member or when only a single member is needed.

{
"member0": 55,
"member1": [1,2,3,4,5],
"member2": {
"a": 123.4,
"b": "found me"
}
}

With the previous JSON data, the next example will extract the member "a.b", the "b" member of the "a" member of the root object.

Too see a working example using this code, refer to cookbook_parsing_individual_members1_test.cpp.

{c++}
std::string b_value = daw::json::from_json<std::string>( json_data, "a.b" );

b_value should have a value of "found me"

Below shows when member is known to be an array and full control of the resulting collection is needed.

Too see a working example using this code, refer to cookbook_parsing_individual_members2_test.cpp.

{c++}
std::vector<int> values = daw::json::from_json_array<int>( json_data, "member1" );

Specifying array indexes

In the member path array indexes are specified inside square brackets [ and ]. Below the 3rd item of "member1" will be extracted

Too see a working example using this code, refer to cookbook_parsing_individual_members3_test.cpp.

{c++}
int third_value = daw::json::from_json<int>( json_data, "member1[2]" );